pingmon.sh

   1 #!/bin/bash
   2 #
   3 # vi: set softtabstop=4 shiftwidth=4 tabstop=8 expandtab:
   4 #
   5 # Pings a list of hosts and saves the summary to the directory given in the
   6 # first argument.
   7
   8 usage()
   9 {
  10     echo "usage: $0 outdir host1 [host2 [...]]" 1>&2
  11     exit 1
  12 }
  13
  14 outdir=$1
  15 shift
  16 hosts="$@"
  17
  18 if [ -n "$outdir" ] && [ -n "$hosts" ]
  19 then
  20     :
  21 else
  22     usage
  23 fi
  24
  25 if ! [ -d "$outdir" ]
  26 then
  27     echo "output directory $outdir does not exist" 1>&2
  28     exit 1
  29 fi
  30
  31 filestamp="$(date +%Y-%m-%d)"
  32 timestamp="$(date +%H:%M:%S/%s)"
  33 file="$outdir/pingmon.$filestamp"
  34
  35 if ! [ -f "$file" ]
  36 then
  37     echo -e "\t\t\tHOST\t\tloss%\trttavg" > "$file"
  38 fi
  39
  40 for h in $hosts
  41 do
  42     ping -q -c 50 -i0.5 "$h" | tail -2 > "$outdir/pending.$h" &
  43     sleep 0.1
  44 done
  45
  46 wait
  47
  48 echo >> "$file"
  49 for h in $hosts
  50 do
  51     p="$outdir/pending.$h"
  52
  53     # 20 packets transmitted, 20 received, 0% packet loss, time 9500ms
  54     # rtt min/avg/max/mdev = 0.132/0.143/0.157/0.013 ms
  55
  56     pktloss=$(grep "packet loss" "$p" | sed -e 's,^.* \([0-9.]\+\)%.*$,\1,')
  57
  58     rttavg=$(grep rtt "$p" |
  59              sed -e 's,^.*\([0-9.]\+\)/\([0-9.]\+\)/\([0-9.]\+\)/\([0-9.]\+\).*$,\2,')
  60     echo -e "$timestamp\t$h\t$pktloss\t$rttavg" >> "$file"
  61
  62     rm -f "$p"
  63 done